Counterbalance device for molding-machines.



APPLICATION FILED MAR. 1, m1.

Patentd Apr. 8, 1919.

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nn'rrnn srATE P TE T r ABBOTT ALLEN, or DUNELLEN, NEW JERSEY, ASSIGNOR ro a MUMFORD COMPANY,-

OF ELIZABETH, NEW JERSEY, A CORPORATION 0E NEWJERSEY.

COUNTERBALANCE DEVICE non MOLDING-MACHINES.

"Application filed-March 1,1917. Serial 11041 1 41: 1

that type of molding machine in which there is a trunnioned ramming yoke against which the mold to be rammed is squeezed, such for example as in plain power squeezers, combination jolt and squeeze machines, and split pattern machines or combinations thereof.-

It has for one of its primary objects the provision of a simple, compact, economical and effective counterbalance means whereby the manipulation of the ramming yoke is rendered easy and expeditious. The foregoing, together with of which is illustrated inthe accompanying drawings, wherein Figure 1 is a front elevation and partial section of a plain power squeezer showing.

the invention applied thereto, and Fig. 2 is an. end elevation and partial section of the 1 machine shown in Fig. 1.

. table 10 at its top- A transverse shaft 11.

The plain power squeezer shown in the drawings comprises a hollow base casting 7 mounted upon which is a cylinder 8 in whlch works a plunger 9 provided with a mold is mounted in the base7, .and pinned to the ends of the shaft by means of the pins 12 are two tubular side rods13 which, in con junction with the strain bar 14, constitute a ramming yoke which in operative position occupies the position shown in full lines in Figs. 1 and 2, and in inoperative position, the position indicated in dotted lines in Fig. 2.

The ramming yoke is provided with a ramming block or platen 15 against which the sand in the flask or flasks mounted on the mold table 10 is compressed or squeezed by means of the introduction of fluid pressure such as air beneath the plunger 9 which effects the elevation of the plunger and the parts carried thereby toward the platen. At. extremes of movement the ramming yoke Specification of Letters Patent.

such 1 otherobjects as may hereinafter appear, orare incident to the invention, are :attained by means of a construction, the preferred form comes against the stops 1 6 and 17 (see Fig. 2).

1 The operation ofthe machine thus far de'-" scribed 1s as follows, assumin that'theramming yoke occupies the dotte line position.

The flask or flasks being in position upon the mold table 10, and belng filled with sand, the rammingyoke is swung until it' occupies the full line position, whereupon air-is in- 'troduced beneath the plunger 9-in the usual manner (by means not shown) and the mold parts are advanced toward the platen l5 and the sand 18 tightly squeezed or rammed,

forming the proper mold cavities in the sand. The air is then exhausted, the rams mlng yoke swung to the dotted line position and the mold'removed, when the ready for another operation. v

The ramming yoke is manipulated" by hand, and since it is quite heavy, it is de sirable to provide counterbalancemeans to render the manipulation of the ramming yokeeasy. I This is not the firstinsta nc'e in the molding machine art inwhich counterbalance means have been provided,- and the invention resides in improvements over the customary counterbalance means employed;

Such means will nowibedescribed.

Mounted upon the: shaft'llywithin' the base casting 7 at spaced intervals, are two collars 18, eachof which is secured in place Patented A r.,s,'1919.

machine is by means of a pin 19 and is provided with:

a downwardly depending nose20adapt'ed to be pivotallysupported 1n the'clevised end '21 of a cup-shaped member 22* Acomprese sionlsprin v23 is supported. between each member 22 and a similar mem': ber 24, the spring being positioned with recup-shape speot to said membersby meansof the1cen tral bosses 26. The cup-shaped members are loosely engaged by: adjustingstuds '25 threaded into the Wall of the base casting,

7 and are held in position over the ends of said studs by means of the springs 23. The studs 25 perform the doublefunctionof as sisting' in positioning the cups 24 and in varying the amount of pressure exerted by the sprlngs 23.

Assuming that the ramming yoke is in the full line position, when it is swung to the dotted line position, the noses 20' will of course be swung around, but since they are offset with respect to the center line of the shaft 11, and since the cups 22 are pivotally mounted thereon, it will be apparent that the springs 23 will not be materially shifted out of the plane in which they extend when the ramming yoke is in full line position, although of-course they will be under compression. The advantage of this arrangement will be obvious. In the first place, it is unnecessary to increase the size of the base casting, as would be the case were the springs to be shifted materially. In the next place, both the cups 22 and 24 accommodate themselves to the change in position of the parts so that the springs are at all times adequately supported and uniformly compressed. It is preferred that the springs be so adjusted that when in full line position, the ramming yoke is lightly held in position against the stop 16, while when in dotted line position, the weight of the ramming yoke is just sufiicient to cause the ramming yoke to lie against the stop 17, that is to say, the weight of the parts is just sufficient to overcome the pressure exerted by the compression springs. ramming yoke easy to manipulate.

1. In a molding machine, the combination of a base, a shaft trunnioned therein, a ramming yoke mounted on said shaft, a pair of spaced downwardly depending arm-like members on said shaft within the base, and a counterbalance compression spring engaging'each of said members and mounted within'the base and interposed between the base and each of said members.

2. In a molding machine, the combination ofa base, a shaft trunnioned therein, a ramming yoke carried by said shaft, two spaced, downwardly extending arms on said shaft, a spring-engaging member pivotally mounted on each arm, and a compression spring adapted to engage each spring-engaging member.

, 3; In a molding machine, the combination of a base, a shaft trunnioned therein, a ramming yoke carried by said shaft, two spaced, downwardly extending arms on said shaft, a springengaging member pivotally mounted on each arm, a second pair of spring-engaging members supported in the base in aline'ment with the first pair of spring-engaging members, and a compression spring between each pair of members.

" 4. In a molding machine, the combination This makes the of a base, a shaft trunnioned therein, a ram ming yoke carried by said shaft, two spaced, downwardly extending arms on said shaft, a springengaging member pivotally mounted on each arm, a second pair of spring-engaging members loosely supported in the base in alinement with the first pair of spring-engaging members, and a compression spring between each pair of members.

In a molding machine, the combination of a base, a shaft trunnio-ned in the base, a ramming yoke mounted on the shaft, an offset downwardly projecting arm on said shaft, a spring-engaging member pivotally mounted on said arm, and a compression. spring adapted to engage said member.

6. In a molding machine, the combination of a base, a shaft trunnioned in the base, a ramming yoke mounted on the shaft, an offset downwardly projecting arm on said shaft, a spring-engaging member pivotally mounted on said arm, a second spring-engaging member supported in the base, and a compression spring between said members.

7Q In a molding machine, the combination of a base, a shaft trunnioned in the base, a ramming yoke mounted on the shaft, an ofiset downwardly projecting arm on said shaft, a spring-engaging member pivotally mounted on said arm, a second spring-engaging member supported in the base, and a compression spring between said members, together with means for altering the compression of said spring. A

8'. In a molding machine, the combination of a base, a shaft trunnioned in said base, a ramming yoke mounted on said shaft, a pair of collars non-rotatively mounted on said shaft at spaced intervals, each collar being. provided with a downwardly extending arm offset with respect to the center line of the shaft, a' cup-shaped spring-engaging member pivotally mounted 'on each arm, a second cup-shaped member in opposition to each of the aforesaid cupshaped members, a compression spring between each pair of cup-shaped members, and means whereby the second'pair of cup-shaped members are looselysupported in the base.

In testimony whereof I have hereunto signed my name.

' ABBOTT ALLEN.

(Main 01 this patent may be obtained for an cents each, by addressing the- Commissioner of Patents, 4 V Washington, D. G. 

